CN220785696U - Moving shaft connecting structure - Google Patents

Abstract

The utility model provides a movable shaft connecting structure, which can improve the reliability of a retractor and reduce the manufacturing cost. The movable shaft connecting structure comprises a movable shaft and a fixed shaft; the device also comprises a torsion bar, wherein the left side of the torsion bar is provided with a first bulge, and the right side of the torsion bar is provided with a second bulge; the torsion bar is fixedly connected with the fixed shaft through a first bulge, and a second bulge of the torsion bar extends into the movable shaft along the axial direction; the device further comprises a groove arranged in the radial direction of the moving shaft, wherein a limiting stop pin is arranged in the groove, and the position of the limiting stop pin along the axial direction corresponds to the position of the second protrusion. In the concrete installation, the right side terminal surface of spacing backing pin and the bellied left side terminal surface butt of second improve overall structure's reliability, still improve the installation effectiveness of each part simultaneously, reduced manufacturing cost.

Description

Moving shaft connecting structure

Technical Field

The utility model relates to the technical field of retractors, in particular to a movable shaft connecting structure of a retractor.

Background

Many middle-high-end cars now use safety belts with pretensioners and force limiters. The pretensioner is used to eliminate the surplus tension allowance of the safety belt as much as possible, and prevent the head of the passenger from being injured by the exploded safety air bag. The force limiter can reduce the tension of the safety belt when the stress peak arrives so as to reduce the stress of the ribs and shoulders of the passenger. The force limiter is provided with a moving shaft, a fixed shaft and a torsion bar, and the moving shaft and the fixed shaft need to rotate together when the wearing safety belt is pulled out normally. When collision occurs, the fixed shaft is locked, and the movable shaft drives the torsion bar to twist, so that the force limiting function is realized. In specific use, when the force limiting function is not started, the movable shaft, the fixed shaft and the torsion bar are reliably connected and are not loosened. When the force limiting function is started, the connecting structure of the movable shaft, the fixed shaft and the torsion bar can not prevent the movable shaft from rotating, the force limiting value is not influenced, and the reliable connection of the movable shaft, the fixed shaft and the torsion bar can be continuously ensured.

The prior art chinese invention patent CN102341279B provides a seat belt device. The safety belt device discloses a structure in which a movable shaft and a fixed shaft are connected by a pin; that is, a plurality of pins are extended from the end face of the moving shaft, then the pins are embedded into the fixed shaft, and then the relative positions of the fixed shaft and the moving shaft are fixed by screwing the heads of the pins, and the patent is specifically referred to as fig. 3. In practical application, if the size of the pin is too small or the rigidity is too low, the structure can lead to early damage when the load of the retractor is locked, and faults are easy to occur; if the size of the pin is too large or the rigidity is too high, the phenomena of force limiting overshoot and the like are easy to occur; meanwhile, the structure is complex to install, the pin on the moving shaft needs to be penetrated into the corresponding hole on the fixed shaft and then the head of the pin is riveted, and the manufacturing cost is high.

Therefore, how to improve the connection structure of the retractor shaft to improve the reliability and reduce the manufacturing cost is a problem to be solved by those skilled in the art.

Disclosure of utility model

The utility model aims to solve the technical problems in the prior art and provides a movable shaft connecting structure, so that the reliability of a retractor is improved, and meanwhile, the manufacturing cost is reduced.

The technical scheme of the utility model is realized by the following measures, namely a movable shaft connecting structure comprises a movable shaft and a fixed shaft; the device also comprises a torsion bar, wherein the left side of the torsion bar is provided with a first bulge, and the right side of the torsion bar is provided with a second bulge; the torsion bar is fixedly connected with the fixed shaft through a first bulge, and a second bulge of the torsion bar extends into the movable shaft along the axial direction; the device further comprises a groove arranged in the radial direction of the moving shaft, wherein a limiting stop pin is arranged in the groove, and the position of the limiting stop pin along the axial direction corresponds to the position of the second protrusion.

Further, the position of the limit stop pin along the axial direction is matched with the groove.

Further, the limiting stop pin is further provided with a first curved surface, and the first curved surface is matched with the molded surface of the torsion bar.

Further, the second protrusion may be a gear ring, and the first curved surface may be a C-shaped curved surface, a T-shaped curved surface, or an a-shaped curved surface.

The application relates to a movable shaft connecting structure, which comprises a movable shaft, a fixed shaft and a braid, wherein the fixed shaft is positioned on the side wall of the movable shaft, the braid is wound outside the movable shaft, and the movable shaft, the fixed shaft and a torsion bar rotate together in the process of drawing the braid when the braid is worn, and no relative rotation exists among the movable shaft, the fixed shaft and the torsion bar; when collision occurs, the fixed shaft is locked, the braid is pulled out, at the moment, the movable shaft rotates to twist the torsion bar, and relative rotation exists between the movable shaft and the fixed shaft. In the present application, the direction along which the axis of the moving shaft extends is an axial direction, and the direction perpendicular to the axial direction is a radial direction. The torsion bar is in a shaft-shaped structure, a first annular bulge is arranged on the left side of the torsion bar, and a second annular bulge is arranged on the right side of the torsion bar; a hole structure is arranged in the moving shaft along the axial direction, the torsion bar is positioned in the hole structure, the left side of the torsion bar is fixedly connected with the fixed shaft through a first bulge, and a second bulge of the torsion bar extends into the moving shaft along the axial direction; grooves are formed in the radial direction of the moving shaft, and penetrate through the hole structures; a limiting stop pin is arranged in the groove and is positioned above the torsion bar; the position of the limit stop pin along the axial direction corresponds to the second bulge; in the concrete installation, the position of the limiting stop pin along the axial direction is matched with the groove, specifically, the right end face of the limiting stop pin is mutually abutted with the left end face of the second bulge, and the left end face of the limiting stop pin is abutted with the left end face of the movable shaft groove, so that the limiting effect on the torsion bar in the axial direction can be achieved, the torsion bar is limited in the axial direction, the axial deflection of the torsion bar in use is prevented, the reliability of the integral structure is improved, and meanwhile, the combined structure of the groove and the limiting stop pin for limiting the torsion bar is adopted, so that the installation and the disassembly are convenient, the installation efficiency of each part is improved, and the manufacturing cost is reduced.

Description of the drawings:

FIG. 1 is a schematic view of a first perspective view of a shaft connection structure according to the present utility model;

FIG. 2 is a schematic cross-sectional view of A-A in FIG. 1;

FIG. 3 is a schematic view of a second perspective of the shaft connection structure of the present utility model;

FIG. 4 is a schematic view of a third perspective view of the shaft connecting structure of the present utility model;

reference numerals:

100 moving shafts, 110 torsion bars, 111 first bulges, 112 second bulges, 120 grooves, 200 fixed shafts, 310 limit stop pins, 311 first curved surfaces, 320 belt pins and 330 woven belts.

Detailed Description

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The embodiment discloses a connecting structure of a moving shaft 100, which comprises the moving shaft 100 and a fixed shaft 200; the torsion bar 110 is further comprised, a first protrusion 111 is provided on the left side of the torsion bar 110, and a second protrusion 112 is provided on the right side; the torsion bar 110 is fixedly connected with the fixed shaft 200 through the first protrusion 111, and the second protrusion 112 of the torsion bar 110 extends into the movable shaft 100 along the axial direction; the device further comprises a groove 120 arranged in the radial direction of the moving shaft 100, and a limit stop pin 310 is arranged in the groove 120, and the limit stop pin 310 corresponds to the second protrusion 112 along the axial direction.

As shown in fig. 1 to 4, in a specific use of the present application, a connection structure of a moving shaft 100 includes a moving shaft 100, a fixed shaft 200 and a webbing 330, wherein the fixed shaft 200 is located on a side wall of the moving shaft 100, and the webbing 330 is wound around the moving shaft 100; during the process of drawing the webbing 330 when in wear, the movable shaft 100, the fixed shaft 200 and the torsion bar 110 rotate together, and no relative rotation exists among the three; when collision occurs, the fixed shaft 200 is locked, the webbing 330 is pulled out, and at this time, the movable shaft 100 rotates to twist the torsion bar 110, and the movable shaft 100 and the fixed shaft 200 relatively rotate.

The torsion bar 110 is in a shaft-shaped structure, a first annular bulge is arranged on the left side of the torsion bar 110, and a second annular bulge is arranged on the right side of the torsion bar 110; a hole structure is arranged in the moving shaft 100 along the axial direction, the torsion bar 110 is positioned in the hole structure, the left side is fixedly connected with the fixed shaft 200 through a first bulge 111, and a second bulge 112 of the torsion bar 110 extends into the moving shaft 100 along the axial direction; a groove 120 is arranged in the radial direction of the moving shaft 100, and the groove 120 penetrates through the hole structure; a limit stop pin 310 is arranged in the groove 120, and the limit stop pin 310 is positioned above the torsion bar 110; wherein the stopper pin 310 corresponds in position to the second protrusion 112 in the axial direction; in the specific installation, the right end face of the limit stop pin 310 is mutually abutted with the left end face of the second protrusion 112, so that the limit effect on the torsion bar 110 can be achieved in the axial direction, the torsion bar 110 is prevented from axial deflection in use by limiting the torsion bar 110 in the axial direction, the reliability of the integral structure is improved, and meanwhile, the combined structure of the groove 120 and the limit stop pin 310 for limiting the torsion bar 110 is adopted, so that the installation and the disassembly are convenient, the installation efficiency of each part is improved, and the manufacturing cost is reduced.

In other embodiments of the present application, a belt pin 320 is also disposed within the groove 120, see fig. 2 and 4; wherein the belt pin 320 is located above the limit stop pin 310; the webbing 330 is disposed around the strap pin 320, and the strap pin 320 is spaced from the stopper pin 310 by the webbing 330, and the stopper pin 310 is movably disposed between the webbing 330 and the torsion bar 110. In use, the webbing 330 is wound around the shaft 100, the tail of the webbing 330 is sewn with a strap pin 320, and the strap pin 320 prevents the tail of the webbing from being pulled out when force is limited. When the force limiting occurs, after the fixed shaft 200 is locked, the webbing 330 is pulled out to drive the moving shaft 100 to rotate, so as to twist the torsion bar 110, thereby achieving the force limiting effect. Specifically, the end of the webbing 330 is connected to the driven shaft 100 through the pair of belt pins 320, and the stopper pin 310 restricts the torsion bar 110 from backing out of the driven shaft 100; the tail of the webbing 330 is sewn around the strap pin 320, a step is provided in the groove 120, wherein the strap pin 320 is embedded at the step, and when the webbing 330 is stressed, the strap pin 320 is embedded at the step, and the tail of the webbing 330 is prevented from being pulled out by the step structure. Further, in the application, the belt pin 320 adopts a flat strip structure, and one side of the limit stop pin 310 close to the belt pin 320 also adopts a surface structure matched with the belt pin 320, so that the corresponding areas of the belt pin 320 and the limit stop pin 310 are improved, and the stability of the limit force is further improved.

Further, in other embodiments of the present application, the position of the stopper pin 310 in the axial direction corresponds to the groove 120. As shown in fig. 3, the groove 120 is an opening with a rectangular shape as a whole, two sides of the limit stop pin 310 along the axial direction correspond to two sides of the groove 120 along the axial direction respectively, in actual use, the right side surface of the groove 120 is flush with the left side surface of the second protrusion 112, in installation, the right side surface of the limit stop pin 310 is attached to the right side surface of the groove 120, and the left side surface of the limit stop pin 310 is attached to the left side surface of the groove 120; this achieves quick installation and also reduces play of the limit stop pin 310 during use, further improving the stability of the limit force. By providing the stopper pin 310, the torsion bar 110 can be prevented from coming out of the driven shaft 100.

Further, in other embodiments of the present application, the stopper pin 310 is further provided with a first curved surface 311, and the first curved surface 311 matches the profile of the torsion bar 110. As shown in fig. 2, 3 and 4, the profile of the torsion bar 110 is an arc surface, and a first curved surface 311 matched with the arc surface is arranged on the inner side of the limit stop pin 310, so that the limit stop pin 310 contacts with the torsion bar 110 more compactly, and the external dimension of the structure of the application is reduced; meanwhile, the first curved surface 311 is matched with the molded surface of the torsion bar 110, so that the movable space of the limit stop pin 310 during rotation of the movable shaft 100 is reduced, the limit stop pin 310 is ensured to have no relative motion with the movable shaft 100, and the stability of the structure in force limitation can be improved. In other embodiments of the present application, the surface area of the first curved surface 311 occupies 1/5 to 1/3 of the surface area of the torsion bar 110, as shown in fig. 2, so that the force-limiting stability is the best.

Further, in other embodiments of the present application, the second protrusion 112 is a gear ring, particularly a spline, which further reduces manufacturing costs. To further improve the force-limiting stability, the second protrusion 112 may be selected as a gear ring, and the first curved surface may be selected as a C-shaped curved surface, a T-shaped curved surface, or an a-shaped curved surface. In one embodiment, the second protrusion 112 is a spline gear ring, and the first curved surface 311 is a C-shaped curved surface, where two ports of the C-shaped curved surface extend into two adjacent spline gaps, so as to better prevent the torsion bar 110 from disengaging from the driven shaft 100. In one embodiment of the present application, the second protrusion 112 is a spline gear ring, and the first curved surface 311 is a T-shaped curved surface, where the distance between two ports of the T-shaped curved surface is greater than the gap between two adjacent splines, so as to better prevent the torsion bar 110 from disengaging from the driven shaft 100. In one embodiment of the present application, the second protrusion 112 is a spline gear ring, and the first curved surface 311 is a T-shaped curved surface, wherein one side of the a-shaped curved surface, which is close to the russian protrusion, is smaller than the gap between two adjacent splines, so that the torque rod 110 can be better prevented from being separated from the driven shaft 100 in use.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (5)

1. The utility model provides a movable shaft connection structure which characterized in that: comprises a movable shaft (100) and a fixed shaft (200); the torsion bar (110) is further arranged, a first bulge (111) is arranged on the left side of the torsion bar (110), and a second bulge (112) is arranged on the right side of the torsion bar (110); the torsion bar (110) is fixedly connected with the fixed shaft (200) through a first bulge (111), and a second bulge (112) of the torsion bar (110) extends into the movable shaft (100) along the axial direction; the device further comprises a groove (120) arranged in the radial direction of the moving shaft (100), a limiting stop pin (310) is arranged in the groove (120), and the limiting stop pin (310) corresponds to the second protrusion (112) in position along the axial direction.

2. A movable shaft connecting structure according to claim 1, wherein: the position of the limit stop pin (310) along the axial direction is matched with the groove (120).

3. A movable shaft connection structure according to claim 1 or 2, characterized in that: the limiting stop pin (310) is further provided with a first curved surface (311), and the first curved surface (311) is matched with the molded surface of the torsion bar (110).

4. A movable shaft connecting structure according to claim 3, wherein: the second bulge (112) is a gear ring, and the first curved surface (311) is a C-shaped curved surface.

5. The movable shaft connecting structure according to claim 1, 2 or 4, characterized in that: the right end face of the limit stop pin (310) is abutted with the left end face of the second bulge (112) of the torsion bar (110); the left end face of the limit stop pin (310) is abutted with the left end face of the groove (120) of the moving shaft (100).